Switching activity analysis and power estimation for multiple constant multiplier block of FIR filters

The switchings in the multiple constant multiplier (MCM) block of FIR filters are heavily affected by the spatial correlation of inputs at each computation unit-adders in this case. In this work, a new switching activity model for the MCM blocks is developed by taking the spatial correlation of inputs of each adder into consideration. Based on this model, a power measurement is proposed to estimate the power consumption of the MCM blocks of FIR filters. The dynamic power simulation of several benchmark filters shows that the accuracy of our model outperforms that of existing models such as Glitch Path Count, Glitch Path Score and Power Index.